Hi I have read through a lot of threads and it seem the CCM 2 1/2 front and 1" rear is a good leveling kit for my 2011 Z71. My question is about wheel size and tire size. I like the look of 18" wheels but have not seen many 20" wheels, I am open to either. The wheels I like are KMC Addict or Method Standard . Also what tire size can I use without rubbing or cutting with this set up? I like the look of Mud-Terrain T/A KM2, will the 285/70/18 fit, I also like the Nitto Trail 285/65/18. Or should I just stay within the tire size that is stock and skip the leveling kit? Whats your opinion on wheel size and tire size that will fit this set up? Is the Chevy dealership or a tire shop the best place to have this done? Thanks!